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7 results on '"Timur Osipov"'

1. Characterizing isolated attosecond pulses with angular streaking

Author

Adi Natan, James P. Cryan, Dipanwita Ray, Ryan Coffee, Timur Osipov, Agostino Marinelli, Siqi Li, Kareem Hegazy, Zhaoheng Guo, and Zhirong Huang

Subjects
Physics, business.industry, Attosecond, Phase (waves), Physics::Optics, Reconstruction algorithm, Laser, 01 natural sciences, Noise (electronics), Atomic and Molecular Physics, and Optics, Photon counting, Streaking, Energy modulation, law.invention, 010309 optics, Optics, law, Electric field, Ionization, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, business, Circular polarization
Abstract

We present a reconstruction algorithm for isolated attosecond pulses, which exploits the phase dependent energy modulation of a photoelectron ionized in the presence of a strong laser field. The energy modulation due to a circularly polarized laser field is manifest strongly in the angle-resolved photoelectron momentum distribution, allowing for complete reconstruction of the temporal and spectral profile of an attosecond burst. We show that this type of reconstruction algorithm is robust against counting noise and suitable for single-shot experiments. This algorithm holds potential for a variety of applications for attosecond pulse sources.

Published
2018

2. Transient NEXAFS Spectroscopy at the Oxygen Edge: Pinning Down ππ*/nπ* Internal Conversion

Author

Andrea Battistoni, P. Bucksbaum, O. Plekan, A. Natan, Melanie Mucke, Giacomo Coslovich, Nora Berrah, R. Coffee, Timur Osipov, R. Feifel, Todd J. Martínez, Rolf H. Myhre, Kelly J. Gaffney, A. Sage, M. Gühr, Razib Obaid, H. Koch, James P. Cryan, S. P. Moeller, S. Coriani, Richard J. Squibb, J. Grilj, S. Myabe, Thomas J. A. Wolf, and S. Wang

Subjects
Materials science, chemistry, Analytical chemistry, Nexafs spectroscopy, chemistry.chemical_element, Transient (oscillation), Edge (geometry), Internal conversion (chemistry), Molecular physics, Oxygen
Published
2016

3. Mapping Electronic States and Associated Dynamics of Non-Linearly Ionized Atoms and Molecules

Author

Peter van der Meulen, J. Grilj, Melanie Mucke, Raimund Feifel, Robert Richter, Ryan Coffee, Li Fang, Maria Novella Piancastelli, John H. D. Eland, Brian K. McFarland, Marc Messerschmidt, Richard D. Thomas, Nora Berrah, M. Koch, M. Glownia, Shin-ichi Wada, Vitali Zhaunerchyk, James P. Cryan, Richard J. Squibb, Lutz Foucar, John D. Bozek, Timur Osipov, P. Linusson, Peter Salén, S. Schorb, Magdalena Kaminska, Koji Motomura, Brendan Murphy, Christoph Bostedt, Markus Gühr, Kevin C. Prince, E. F. Sistrunk, Mats Larsson, S. Mondal, M. Siano, Osamu Takahashi, Kiyoshi Ueda, and Leszek J. Frasinski

Subjects
Photon, Chemistry, Astrophysics::High Energy Astrophysical Phenomena, Ionization, Atoms in molecules, Molecule, Electron, Atomic physics, Covariance, Absorption (chemistry), Molecular physics, Photon counting
Abstract

Covariance maps of correlated electron emission processes associated with the formation of multiply-ionized core hole states and subsequent decay processes of atoms and molecules upon absorption of x-ray photons from an FEL source are presented.

Published
2013

4. Delayed Ultrafast X-ray Induced Auger Probing

Author

Li Fang, J. White, Brian K. McFarland, Sebastian Schorb, Ryan Coffee, Markus Gühr, William E. White, Alex Aguilar, Melanie Mucke, Th. Schultz, Vladimir S. Petrovic, Raimund Feifel, James M. Glownia, Timur Osipov, Brendan Murphy, J. C. Castagna, Christoph Bostedt, Kelly J. Gaffney, John D. Bozek, P. H. Bucksbaum, Todd J. Martínez, Song Wang, Nora Berrah, M. Swiggers, J. P. Farrell, Ian Tenney, Limor S. Spector, S. Miyabe, Francesco Tarantelli, James P. Cryan, and Adi Natan

Subjects
Physics, Instrumentation, Atomic and Molecular Physics, and Optics, Astrophysics::High Energy Astrophysical Phenomena, X-ray, X-ray optics, Molecular physics, Auger, Molecular dynamics, Atomic and Molecular Physics, Ionization, Physics::Atomic and Molecular Clusters, Site selective, Spontaneous emission, Physics::Atomic Physics, and Optics, Physics::Chemical Physics, Atomic physics, Ultrashort pulse
Abstract

We present a new method for probing photoexcited molecular dynamics based on the site selective ionization via ultrafast x-rays followed by Auger decay.

Published
2013

5. Fragmentation Pathways of Molecules Multiply Ionized by Pulses from the LCLS Intense X-ray Laser

Author

Timur Osipov

Subjects
X-ray laser, Fragmentation (mass spectrometry), Chemistry, Ionization, Molecule, Atomic physics, Kinetic energy
Abstract

Molecular fragmentation dynamics induced by intense X-ray FEL pulses is studied by examining the kinetic energy of different m/q fragment species from small (e.g. N$_2$) as well as medium size molecules (e.g. SF$_6$)

Published
2013

6. High harmonic probes of inner electron sub-cycle dynamics in molecules

Author

Philip H. Bucksbaum, Brendan Murphy, William E. White, Limor S. Spector, Markus Gühr, Th. Schultz, Song Wang, Francesco Tarantelli, Kelly J. Gaffney, Ian Tenney, Sebastian Schorb, R. Feifel, John D. Bozek, Todd J. Martínez, R. Coffee, Nora Berrah, J. White, Li Fang, J. P. Farrell, Melanie Mucke, Vladimir S. Petrovic, Brian K. McFarland, James P. Cryan, Adi Natan, James M. Glownia, C. Bostedt, S. Miyabe, and Timur Osipov

Subjects
chemistry.chemical_compound, Auger electron spectroscopy, Soft x ray, chemistry, Photoprotection, Molecule, Soft X-rays, Photochemistry, Ultrashort pulse, Thymine, Nucleobase
Abstract

We present our first results of a UV-pump X-ray-probe study of the photoprotection mechanism of thymine. The experiment used element specific Auger spectroscopy and was carried out at the LCLS.

Published
2012

7. Ultraintense X-Ray Induced Multiple Ionization and Double Core-Hole Production in Molecules

Author

Pavle Juranić, John D. Bozek, Francesco Tarantelli, P. van der Meulen, Kevin C. Prince, Motomichi Tashiro, Masahiro Ehara, Brendan Murphy, Christoph Bostedt, Henning T. Schmidt, M. N. Piancastelli, Li Fang, Edwin Kukk, Timur Osipov, Shin-ichi Wada, Kiyoshi Ueda, P. Salen, Raimund Feifel, Nora Berrah, Mats Larsson, Robert Richter, and Richard D. Thomas

Subjects
Physics, Instrumentation, Atomic and Molecular Physics, and Optics, Astrophysics::High Energy Astrophysical Phenomena, X-ray, Synchrotron radiation, Radiation, Molecular physics, Core (optical fiber), Atomic and Molecular Physics, Ionization, Femtosecond, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, and Optics, Atomic physics, Absorption (electromagnetic radiation), Spectroscopy
Abstract

We used the world first hard x-ray FEL to investigate the response of molecular systems to the ultraintense, femtosecond x-ray radiation. We report sequential multiphoton ionization, frustrated absorption and double core hole production mechanisms.

Published
2011

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